Automatic transmission control device

Details Automatic transmission control device Automatic transmission control device

2007-03-20

2007-03-20

Pang, Roger (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

C475S128000

Reexamination Certificate

active

10968950

ABSTRACT:
An automatic transmission control device adjusts a hydraulic pressure of a working fluid to generate pressures applied to a plurality of friction elements of an automatic transmission to control the engagement or disengagement of the friction elements. The control device includes a plurality of electromagnetic valves, a plurality of application pressure control valves, a selector, and a line pressure control valve. The application pressure control valves control pressures applied to the friction elements according to the output pressures of the electromagnetic valves. The selector selects the maximum pressure from the output pressures of the electromagnetic valves. The line pressure control valve controls a line pressure according to the output pressure selected by the selector.

REFERENCES:
patent: 5921888 (1999-07-01), Park
patent: 6102826 (2000-08-01), Takahashi et al.
patent: 6358185 (2002-03-01), Bertsche et al.
patent: 6464610 (2002-10-01), Hisano et al.
patent: 6470763 (2002-10-01), Ohashi et al.
patent: 6475113 (2002-11-01), Suzuki et al.

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